Angular服务在其他服务中不起作用 [英] Angular service doesn't work within other service

问题描述

我正在使用ngx-translate库进行翻译.在我的组件中(延迟加载的路由)，当我设置以下内容时，它可以正常工作:

I'm using ngx-translate library for translations. In my components (lazy loaded routes) When I set the following, it works fine:

constructor( public translate:TranslateService ) {
    this.translate.setDefaultLang( this.langService.lang );
    this.translate.use( this.langService.lang );
}

我有自己的 LangService ，用于保存用户选择的语言.我将其设置为lang属性，并在其中使用TranslateService:

I have my own LangService just to save user's selected language. I set it to lang property and use TranslateService there:

lang:string = "fa";

constructor(public translate: TranslateService) {

    // this works
    console.log(this.lang);

    // this doesn't work
    this.translate.setDefaultLang( this.lang );
    this.translate.use( this.lang );

}

现在，我只是将LangService注入到我的组件中，但是翻译不起作用.有什么主意吗?

Now I simply inject LangService to my component, but the translation doesn't work. Any idea?

注意:我将TranslateModule导入了SharedModule，并在其他延迟加载的模块中导入了该SharedModule.

Note: I imported TranslateModule into a SharedModule, and import that SharedModule in my other lazy loaded modules.

推荐答案

您是否将TranslateModule添加到SharedModule中的导出数组?

Did you add TranslateModule to exports array in SharedModule?

您的自定义LangService是否在根目录中提供?

Is your custom LangService provided in root?

这里是一个例子:

1-您的自定义服务:

1- Your custom service:

@Injectable({
    providedIn: 'root' 
})
export class CustomTranslateService {
       constructor(private translate: TranslateService) {}
}

2-将TranslateModule添加到SharedModule中的导出数组.

2- Add TranslateModule to exports array in your SharedModule.

3-将您的自定义服务注入您的组件中:

3- Inject your custom service in your components:

@Component({
    selector: 'app-footer',
    templateUrl: './footer.component.html',
    styleUrls: ['./footer.component.scss']
})
export class FooterComponent implements OnInit {
    constructor(private translate: CustomTranslateService) {
    }

    ngOnInit(): void {
          // Use it here...
    }

}

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